<style>
body {
  min-width:500px;
  overflow-x:hidden;
  min-height: 500px;
}

img {
  margin:5px;
  border:2px solid black;
  vertical-align:middle;
  width:75px;
  height:75px;
}
</style>

<br />
Welcome
<script>
	chrome.extension.onConnect.addListener(function(port){
		if(port.name=='conport'){
			port.onMessage.addListener(function(msg){
				console.log(msg);
			});
			
			port.postMessage('hello world');
		}
	});
</script>